Postal Service through the years

Patrick Donahoe, postmaster general of the struggling United States Postal Service, "has decided to retire" in February after serving 39 years at the agency, the USPS announced Friday. Check out landmark moments in U.S. Postal Service history.

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1959: The Postal Service experimented with "missile mail," teaming up with the U.S. Navy sub The U.S.S. Barbero to fire missiles containing postal containers instead of ordinance. The cost and numerous failures doomed the program to failure.

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